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Grease composition

A grease composition and composition technology, applied in the field of grease compositions for lubricating rolling bearings, to achieve good mechanical strength and high yield

Inactive Publication Date: 2012-02-08
TOTAL RAFFINAGE MARKETING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, it does not appear that in the prior art all the parameters (in particular those which determine a roughly suitable dispersion of these particulate solids in the lubricant or grease) have been adjusted to the point where solid nanoparticles in the lubricant or grease The maximum anti-friction effect of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] We have compared the performance of bicycle hubs comprising bearings lubricated with different greases to Mavic hubs with ball bearings, such as those mounted on Mavis Cosmic type bicycle wheels, considering the upmarket consumer market in this field. The lubricated bearing hub used is of the type described in patent application EP 1 719 641 .

[0143] The benefits of the rolling bearing system Mavic and the lubricated bearing system are determined according to the test platform:

[0144] - Drive the bicycle wheel with the hub to be tested (hub with Mavic ball bearings or hub with bearings lubricated with different greases) with an electric motor at an initial speed of 70 km / h followed by 50 km / h during a 5 minute heating period .

[0145] - A load of 50 kg is applied to it throughout the duration of the test.

[0146] - At an initial instant, the power to the motor is switched off, and the distance traveled before stopping (or locking) is subsequently measured.

[0...

Embodiment 2

[0167] Example 2: Effect of base oil

[0168] The same polytetrafluoroethylene nanoparticles as used in grease D according to the invention were added to grease (E) based on synthetic base oils of the PAO type, grease E was made with the same lithium metal soap (12-hydroxystearic acid Lithium) thickens.

[0169] An initial PAO+lithium grease (Grease E) was mixed with Grease E (Grease F, G, respectively) containing 3wt% and 5wt% nano-sized PTFE respectively and with 3wt% Grease E (Grease H) of micron PTFE was subjected to 4-bead test ASTM D2266 for anti-wear performance comparison.

[0170] The results are shown in Table 3 below:

[0171]

[0172] Table 3: Anti-wear properties

[0173] Greases E and F, G have the same level of performance: the addition of nanoscale PTFE to the PAO-based grease did not provide a significant improvement in anti-wear properties. At comparable amounts, micron-sized PTFE provides greater gains in terms of wear.

[0174] Without wishing to be...

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Abstract

The invention relates to a grease composition, including: (A) a synthetic base oil mainly consisting of alkylaromatic compound(s) (A1); (B) a thickener mainly consisting at least one fatty acid metal soap; (C) a solid lubricant mainly consisting of nanoparticulate polytetrafluoroethylene, at least 85% of the particles of which are smaller than one micron.

Description

technical field [0001] The present invention relates to a grease composition, especially a grease composition useful for lubricating rolling bearings. Background technique [0002] Liquid lubricants are not suitable for many applications because of their "drift" relative to the lubrication point. These applications are in particular rolling and plain bearings, open gears, metal cables and chain drives, and more often applications that do not include any sealing systems. [0003] For these applications, lubricating greases are used, which are solid or semifluid substances obtained by dispersing a thickener in a liquid lubricant, combined with additives that give them special properties. [0004] The vast majority of greases are prepared using fatty acid metal salt type thickeners. The fatty acid is dissolved in the base oil at a relatively high temperature followed by the addition of a suitable metal hydroxide. After baking to evaporate the water formed during the reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/02C10M169/06C10N10/02C10N10/04C10N10/06C10N10/08C10N20/02C10N20/06C10N20/04C10N30/06C10N40/02C10N40/04
CPCC10M169/02C10M169/06C10M2203/065C10M2205/0285C10M2205/223C10M2207/1206C10M2207/1216C10M2207/1225C10M2207/1256C10M2207/1265C10M2207/1285C10M2213/062C10N2010/02C10N2010/04C10N2010/06C10N2010/08C10N2020/02C10N2020/06C10N2030/06C10N2040/02C10N2050/10C10N2020/065C10N2020/067C10N2040/042C10N2040/044C10N2040/045C10N2040/046F16C33/6688F16C2240/48C10M161/00C10M169/00C10M171/00
Inventor 阿拉因·布费弗兰克·巴尔金
Owner TOTAL RAFFINAGE MARKETING
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